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At <https://commons.wikimedia.org/wiki/Category:Wikimania_2013_DevCamp?useskin=monobook> I'm getting the following in my browser's error console:

---
GET https://commons.wikimedia.org/wiki/Images/ui-bg_glass_75_e6e6e6_1x400.png 404 (Not Found)
---

I'm not sure why.

Looks related to jquery-ui from https://bits.wikimedia.org/commons.wikimedia.org/load.php?debug=false&lang=en-gb&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.triggerQueueCallback%2CloadingSpinner%2CmwEmbedUtil%7Cmw.MwEmbedSupport&only=scripts&skin=monobook&version=20131210T194238Z

When a dialog box appears at <https://www.mediawiki.org/w/index.php?title=Talk:Flow&workflow=050b8fe7de9310412404782bcb0873b9>, I'm getting similar errors:

GET https://www.mediawiki.org/wiki/Images/ui-bg_flat_75_ffffff_40x100.png 404 (Not Found)

GET https://www.mediawiki.org/wiki/Images/ui-bg_glass_75_dadada_1x400.png 404 (Not Found)

GET https://www.mediawiki.org/wiki/Images/ui-bg_flat_0_aaaaaa_40x100.png 404 (Not Found)

GET https://www.mediawiki.org/wiki/Images/ui-bg_glass_75_e6e6e6_1x400.png 404 (Not Found)

GET https://www.mediawiki.org/wiki/Images/ui-bg_highlight-soft_75_cccccc_1x100.png 404 (Not Found)

This is while logged in, using the Monobook skin.